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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E4">Th6</font></span>: <a NAME="T6"><span class="comment"><font color="firebrick">:: LANG1:6</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">G</font> being   non  <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a>   <a href="lang1.html#L1" title="LANG1:struct.1">DTConstrStr</a> <br/>  for <font color="Olive" title="b2">n</font> being   <a href="lang1.html#NM2" title="LANG1:NM.2">String</a> of <font color="Olive" title="b1">G</font> holds  <font color="Olive" title="b2">n</font> <a href="lang1.html#R3" title="LANG1:pred.3">is_derivable_from</a> <font color="Olive" title="b2">n</font></div></div>
